有限状态机 python_python实现有限状态机

from transitions import Machine

定义类

class Matter(object):

pass

model = Matter()

状态定义

states = ['New' , 'Ready', 'Waiting', 'Running','Terminated']

定义状态转移

transitions = [

{'trigger': 'Admitted', 'source': 'New' , 'dest': 'Ready' },

{'trigger': 'Dispatch', 'source': 'Ready', 'dest': 'Running'},

{'trigger': 'Interrupt', 'source': 'Running', 'dest': 'Ready'},

{'trigger': 'InputOutputoreventwait', 'source': 'Running', 'dest': 'Waiting'},

{'trigger': 'InputOutputoreventcompletion', 'source': 'Waiting', 'dest': 'Ready'},

{'trigger': 'Exit', 'source': 'Running', 'dest': 'Terminated'}]

初始化

machine = Machine(model=model, states=states, transitions=transitions, initial='New')

Test

print(model.state)# New

状态转变的完整流程

model.Admitted()

print(model.state)

model.Dispatch()

print(model.state)

model.Interrupt()

print(model.state)

model.Dispatch()

print(model.state)

model.InputOutputoreventwait()

print(model.state)

model.InputOutputoreventcompletion()

print(model.state)

model.Dispatch()

print(model.state)

model.Exit()

print(model.state)